The trend to only three networks operating in a major market in Europe goes on:
After Austria, Ireland and Germany, this is going to happen in Italy and possibly later in the UK (with O2/Three): Wind and Tre (3) Italia are going to merge

I think they are not going to face much of a problem, as the Telefónica merger in Germany passed anti-trust authorities. Possibly Three/Wind has to open up for more MVNOs and give back licences.
It remains to be seen, if the new market leader in Italy will really become their prime network. Experience from Ireland showed quite big problems in the transition period and in Germany Telefónica has the most customers now but still with the worst coverage on their (partly) combined networks.

This merger can sustain a viable 3rd network in Italy (instead of two pretty weak ones), but can it crown a new king?